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http://dx.doi.org/10.9719/EEG.2018.51.4.309

Mineralogical Characteristics of Carbonate Rock-Hosted Naturally Occurring Asbestos from Asan, Muju, Jangsu Areas  

Shin, Eunhea (Center for Asbestos and Environment, Chonnam National University)
Jeong, Hyeonyi (Center for Asbestos and Environment, Chonnam National University)
Baek, Jiyeon (Center for Asbestos and Environment, Chonnam National University)
Jeong, Hyewon (Center for Asbestos and Environment, Chonnam National University)
Park, Jaebong (Center for Asbestos and Environment, Chonnam National University)
Roh, Yul (Center for Asbestos and Environment, Chonnam National University)
Publication Information
Economic and Environmental Geology / v.51, no.4, 2018 , pp. 309-322 More about this Journal
Abstract
Naturally occurring asbestos (NOA) occurs in rocks and soils as a result of natural weathering and human activities. It is proved that inhalation of asbestos fibers can lead to increase risk of developing several diseases such as lung cancer and malignant mesothelioma. The parent rocks of asbestos have been mainly associated with (ultra)mafic and carbonate rock. The previous studies on NOA were mainly limited to (ultra)mafic rock-hosted asbestos, but studies on carbonate rock-hosted asbestos are relatively rare in S. Korea. Therefore, this study was aimed to examine mineralogical characteristics of carbonate rock-hosted NOA at three sites including Muju and Jangsu, Jeonbuk province and Asan, Chungnam province. Types of rocks at the three sites mainly consisted of Precambrian metasedimentary rocks, carbonate rock, and Cretaceous and Jurassic granites. Asbestos-containing carbonate rock samples were obtained for mineralogical characterization. XRD, PLM, EPMA, SEM and EDS analyses were used to characterize mineralogical characteristics of the carbonate rock-hosted NOA. From the carbonate rock, fibrous minerals were occurred acicular and columnar forms in the three sites. Fibrous minerals were composed of mainly tremolite and associated minerals included possibly asbestos containing materials (ACM) such as talc, vermiculite, and sepiolite. The length and aspect ratios of tremolite were similar to the standard asbestiform (length >$5{\mu}m$, length:width = 3:1). These results indicate that both non-asbestiform and asbestiform tremolite with acicular forms occurred in carbonate rocks at three sites. Geological and geochemical characteristics and mineral assemblages indicate tremolite and associated minerals might be formed by hydrothermal alternation and/or hydrothermal veins of carbonate rocks due to intrusion of acidic igneous rocks.
Keywords
naturally occurring asbestos (NOA); tremolite; fibrous; metamorphism; carbonate rock;
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